HELPP me pleaseee! This is nearly due under 30 min. With explanation please thank you.

What signals you that factoring by grouping is the best method to use when factoring a problem?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =